This commit introduces REUSE compliance by annotating all files
with SPDX information and placing the reused licences in the
LICENSES folder.
We additionally removed the docheader tool which is made obsolete
by this change.
The main LICENSE and copyright text of the project is now not under
my personal name anymore, and it belongs to "The Respect Project
Contributors" instead.
This change restores author names to several files, giving the
appropriate attribution for contributions.
The `ValidatorDefaults` is cumbersome, and customising it can be
annoying. Most projects use some sort of dependency injection container,
and by integrating the creation of the `Validator` with the PSR-11, we
allow users to easily customise how they create validators.
Some tasks, like overwriting the `Translator`, become a bit more
verbose, if the user is not already using a PSR-11 container, but I
think that’s a good tradeoff.
I've already changed the `ValidationException` so as not to let the file
and line from the Validator.php [1]. However, one could go even further
when creating more customizations on top of this library, and allowing
to customize the line could be very useful.
What motivated me making this change because it will be handy when I get
back to work on [Assertion][].
[1]: 75a9b8e94f
[Assertion]: https://github.com/Respect/Assertion
Because of how PHP works, when we instantiate an Exception object, the
`file` and `line` properties are the file and line where we created the
object. That's a desirable behaviour, but there's no value for a user to
know that we created an instance of `ValidationException` in the
`Validator` class.
This commit will overwrite the file and line in the
`ValidationException` to where the method `assert()` was called.
Note that when running `check()` it will still point to `Validator`, but
I decided not to change it, as the method `check()` got deprecated.
